Scroll View with automatic content height is not working

Hi,
someone can hep me please?
iam following this tutorial:
http://1darray.com/blog/2016/02/23/ui-scroll-view-automatic-content-height/

I want to do a scrollview with a text inside with automatic height according to the text content.
But my text dont stays with automatic height.
i followed all steps of tutorial, i dont undestand why it is not working.
I put a scrollview. In his content i put a vertical layout and content size fitter with vertical fit prefered size. Inside content...

Scroll View with automatic content height is not working